Ranked according to global revenue for firms with a significant U.S. presence. Published: February 26, 2007

Revenue growth and earnings are strong in the global temporary staffing industry. Continued growth is assured across all geographies as contingent labor becomes a substantial and permanent part of the workforce in virtually all of the major economies and the cyclicality of the industry declines.

The largest staffing firms are spread around the world and engaged in a high number of acquisitions geared to open new markets and provide broader occupational reach. With the strongest growth now occurring in professional and technology positions, firms that once focused on low-skill labor are rapidly adding high-skill positions. The best firms are offering a wider range of services to meet employer needs with greater flexibility.

The five largest staffing firms in the U.S. market are Adecco, Allegis, Manpower, Kelly and Robert Half, according to Staffing Industry Analysts Inc. The top 10 staffing firms in the U.S. market represent almost one-fourth of total U.S. market share.